1 of 7 3/1/2012 7:39 AM BMW TIS Home 5' E60 545i (N62) Saloon Change language: BMW TIS - Intelligent battery sensor: E60, E61, E63, E64 Installation location Item Description Intelligent battery sensor: E60, E61, E63, E64 Installation location The intelligent battery sensor (IBS) is installed at the negative terminal of the battery. Example: E60ne ne Construction The intelligent battery sensor (IBS) is an intelligent, mechatronic component that monitors the battery condition. ne The power supply to the IBS is provided through a separate wire. ne For the purpose of data transmission, the IBS is connected to the digital engine electronics (DME) or digital diesel electronics (DDE) via the bitserial data interface (BSD). ne The intelligent battery sensor (IBS) consists of mechanical components, the electronics module and software. - Mechanical components ne The battery terminal with earth cable is the connection to the negative terminal of the battery and serves to create an electrical contact to the body as the support for the sensor element for current measurements as the support for the electronic module to provide an adequate thermal contact between the temperature sensor and the negative terminal of the battery as protection for the sensitive electronic module as an earth connection for the IBSne The mechanical parts and the electronic module of the IBS are illustrated below.ne - Electronic module ne The electronic module has the task of recording the voltage, the current flow and the temperature of the battery.
2 of 7 3/1/2012 7:39 AM The following components are housed in the electronic module: a shunt (resistance for current measurement) a temperature sensor an electronic evaluation unit on a board ne The board, which is about the size of a fingernail, contains an electronic circuit for evaluating the data measured. The intelligent battery sensor (IBS) is able to withstand thermal loads of up to 105 C and the chemical effect of the battery acid. The IBS thus satisfies the necessary conditions for installation in the engine or luggage compartment. The components of the shunt are illustrated below.ne - Software ne The program in the microcontroller of the intelligent battery sensor (IBS)ne How it works The functions of the intelligent battery sensor (IBS) are: - To continuously measure battery data in all vehicle operating modes - To compute battery indicators as basis for battery charge state (SoC: "State of Charge") and battery condition (SoH: "State of Health") - To balance the charge/discharge current of the battery - To monitor the battery's charge state (SoC) and to activate the electric energy management and power management for countermeasures if the battery charge state becomes critical (battery's limit of starting capability). - To identify initial data for calibrating the battery charge state (SoC: "State of Charge") - To calculate the starting current curve to determine the battery condition (SoH: "State of Health") - To monitor off-load current - To transmit data to the higher-order control unit (DME or DDE) - Self-diagnosis - To perform fully automatic updates of algorithm parameters and parameters for self-diagnosis via DME / DDE - To be able to independently "wake up" from sleep mode The individual functions of the IBS are illustrated below as function blocks in the overall function of the IBS. The processes are elucidated by the arrows.ne The principle for measuring and processing the battery values is illustrated below.ne
3 of 7 3/1/2012 7:39 AM ne Electronic evaluation unit ne The electronic evaluation unit in the IBS (intelligent battery sensor) continuously records the measured data. The IBS uses this data to calculate the battery indicators - Voltage - Current - Temperature The IBS transmits the battery indicator data to the DME or DDE via the bit-serial data interface (BSD). Parallel to the calculation of the battery indicators, a preliminary calculation of the battery's state of charge (SoC) is made. In the time between engine OFF and DME main relay shutdown, the IBS receives information about the maximum charge available for a reliable engine start from the DME/DDE. The IBS continuously monitors the battery charge state (SoC) when the DME main relay has been switched off. The message "Auxiliary consumers OFF" from the DME/DDE instructs auxiliary consumers that are switched on to switch themselves off when the critical battery charge state (battery's limit of starting capability) is reached. Charge balance through IBS ne When the vehicle is out of use, the IBS continuously balances the battery charge state (SoC: "State of Charge"). From terminal 15 ON, the DME/DDE receives updated information about the battery indicators (battery condition "SoH"; battery charge state "SoC"). Off-load current measurement ne When the vehicle is not in use, the IBS continuously monitors the data relevant to the battery indicators. The IBS is programmed to "wake up" every 14 seconds so that it can update the measured values with new measurements. The measuring time is approx. 50 milliseconds (ms). The measured data are entered in the IBS memory for monitoring the off-load current. ne When the engine is restarted, the DME / DDE reads off the off-load current curve. In the event of a deviation from the defined off-load current curve, an entry will be made in the DME / DDE fault memory. Terminal 15 wake-up function ne The terminal 15 wake-up function is only applicable when the vehicle is not in use. The function sequence is as follows: - When "terminal 15 OFF" has been received, the DME / DDE informs the IBS of the maximum battery charge quantity available. After issuing the message about the maximum charge quantity available, the DME / DDE will go into sleep mode. - If the maximum battery charge quantity available has been reached and auxiliary consumers are switched on, the IBS will "wake up" the vehicle (and thus the DME / DDE) via the wake-up wire (terminal 15 wake-up). - When the battery's critical charge state has been reached (battery's limit of starting capability), the DME / DDE instructs the auxiliary consumers to switch themselves off. - The DME / DDE no longer allows the IBS to "wake up" the vehicle. - The vehicle then goes back into sleep mode. The control units connected to the terminal 15 wake-up function are illustrated below.ne
4 of 7 3/1/2012 7:39 AM 1 Intelligent battery sensor (IBS) 1 Spring element (gull wings) on intelligent battery sensor (IBS) 2 Battery negative terminal 1 Battery negative terminal with intelligent battery sensor (IBS) 2 Nut 3 Shim 4 Part of battery negative terminal 5 Screw 6 Electronics module 7 Pressure plate 8 Insulator 9 Cable shoe for battery 10 Insulator negative wire 11 Pressure plate 12 Torx screw 1 Copper 2 Spring element (gull wings)
5 of 7 3/1/2012 7:39 AM 3 Board with electronic evaluation unit 5 Manganin resistance (resistance alloy) 4 Injection-moulded surround 1 Intelligent battery sensor (IBS) complete function 3 Current measurement, ne measuring range of IBS: - Operating current: ne -200 A to +220 A - Off-load current: 0 A to 10 A - Starting current: 0 A to 1000 A 5 Temperature measurement, ne measuring range of IBS:ne -40 C to +105 C 7 Data processing using microcontroller Communication via bit-serial data interface (BSD) 9 Partial calculation of battery charge state and battery condition 11 Driver for bit-serial data interface (BSD) with "wake-up" function 13 Bit-serial data interface (BSD) 15 Internal "wake-up" function 17 Digital engine electronics (DME) or digital diesel 2 Measurement of battery data: - Current - Voltage - Temperature 4 Voltage measurement, ne measuring range of IBS:ne 6 V to 16.5 V 6 Internal voltage regulator for IBS 8 Calculation of battery indicators 10 Management of auxiliary consumers 12 Battery voltage 14 Terminal 15 wake-up wire 16 EEPROM (Electrically Erasable Programmable Read-Only Memory) 18
6 of 7 3/1/2012 7:39 AM electronics (DDE) 1 Battery positive terminal 2 Battery negative terminal 3 Measurement of battery voltage between battery positive terminal and battery negative terminal 5 Measurement of current (A) [indirect, via the proportional voltage drop (V) at the shunt] 7 Bitserial data interface (BSD) for transmitting data to DME 4 Measurement of battery temperature (T) 6 Microcontroller ( m C) in intelligent battery sensor (IBS) 8 Digital engine electronics (DME) 1 Intelligent battery sensor (IBS) 3 Car Access System (CAS) PT-CAN Powertrain CAN Kl. 15 WUP 2 Digital engine electronics (DME) Kl. 30 Terminal 30 Terminal 15 wake-up wire No posts yet. Please register before posting. Username Password Title
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